Sewage-ejector system



Aug. 3 1926.

c. YEoMANs SEWAGE EJECTOR SYSTEM.

Filed Dec. 19 1925 0 MN M hn mm Q a mm QM Charla? l oman/s j I M, C! fjuiw .y 71%. M ii? Patented Aug. 3, 1926 cnannns rnomsor omcaoo, ILLINOIS, assreuon 'ro Ynonnjns wam cou- PM, 01' CHICAGO, ILLINOIS,

a coaronn'rron onmnmors. v

Application filed December an inlet and an outlet for sewage controlled by check valves, is connected to' an air vent when the level of the liquid therein is low, and to a compressed air supply when the level is high.- so that the sewage or the like alternately flows into the receptacle and is discharged therefrom.

In some such systems compressed air is emplo ed not only to empty the ejector receptac e periodically but also, under control of a pilot valve actuated by a float in the receptacle, to operate the automatic valves that eifcct the admission and venting of airv to and from the receptacle. Such an arrangement insures certainty of automatic operation and permits the disposition of most of-the automatically moving parts, in-v cludin any electric switches, in case the plant 18 electrically driven, ,some distance above the pit in which the ejector receptacle is placed, so that they are readily accessible for lubrication, inspection, and the like, and are not subject to the conditions prevailing in the ejector pit. But such systems, while well suited for large installations, are some what complicated and expensive since they require a constant source of compressed air includinga storage tank, a pump for supplying compressed air thereto and means, such as an e ectric switch, automatically con trolled by the air pressure in the tank for starting and stopping the driving motor oi.

the pump.

The present invention seeks to provide a system suitable for small installations, which, while possessing many of the advantages of the system above referred to, is simpler and less expensive, and which avoids the necessity of a constant source of compressedair. To this end, the air pump or compressor is directly connected to the ejector receptacle and means actuated by an independent source of fluid under pressure, preferablyfthe city water supply," is employed to control the starting and stop-ping of the pump and the venting ofair from the receptacle, such fluid pressure means be ing in turn controlled by the: level in'the receptacle. The invention further consists in the features of improvement hereinatter set forth, illustrated in the preferredar- -rangemen-t. inthe accompanying drawing,

1a, 1925. mm m. 78,461. 'i 1 pended claims. A

In the drawings Fig. 1s a view and more particularly pointed out in the apin elevation, with certain parts shown in section, of the improved system.

Fig. 2 is a sectional view o f one form of air pump or compressor that can be employed.

The ejector receptacle 10 may be of any suitable construction. It is arranged as usual in a'pit 11 below the floor level 12. .In the form shown the receptacle is provided with an inlet pipe 13 for the sewage or the like, and with a dischar outlet pipe 14, these pipes being provid with suitable-cutoil' and non-return check valves 15 and 16. As the sewage or the like flows into the receptacle through the inlet pipe 13, air is vented therefrom! through a pipe 17 connected .tov its upper end and extending up,- wardly therefrom. When the receptacle is full, air under pressure is admitted preferably through the pipe 17, to force the contents of the receptacle through the outlet orv dischar 'epipe 14. I

To efect the alternate venting of air from thereceptacle and the admission of compressed air thereto, the pipe 17 in the preferred form shown, is connected. at its upper end to an air exhaust pipe 18 provided with a vent valve 19 and to a comprewed air inlet pipe 20 that is directly connected to an,

ple rotary type, such as s own in Fig. 2, and comprising a rotor 22 mounted on a shaft 23 and provided with spring-pressed wing pistons or vanes 24, the pum shaft being directly connected to the sha 25 of an electric motor 26.

Fluid pressure means 13.16 provided for controlling-the closing andopening of the vent valve 19 and the starting and stopping of the pump motor 26, and preferably", as shown, separate fluid pressure devices of simple form'are employed. Each of these devices comprises a casing 27 connected to a pipe 28 and providedwith a diaphragm 29. The diaphragm of one of the devices is connected to the stem 30 of the vent valve 19 and theudiaphragm of the other device is connected to a rod 31 which actuates a-pi lot switch 32. Springs 33 and 33 on the valve stem 30 andthe rod. 31 normally hold the vent valve and pilot switch open. The pilot switch 34 which serves to'close and open the and to anexhaust pipe 40' which, in the form shown, leads to the inlet pipe 13 of the ejector receptacle.

The stem 41 of the pilot valve has a pin and slot connection with one arm of-a bell crank lever .42 pivotally mounted on the bracket 37 The other arm of the gverhas a pin and slot connection with a oat rod 43 extending upwardly through a stufling box 44 in the top of the receptacle 10.' In the form shown, the float'rod is provided with an open bottom bell 45 at its upper end ang with an open top bell 46 at its lower; en t I Y L;

When the valve 35 is in the position shown in the drawing, it connects the fluid pressure devices to the exhaust pipe so that the 'diaphragms and springs of these devices will hold the vent valve 19 and the pilot switch 32 0 en. Unde these conditions the pump is i 1e and air escapes through the pipe 17 and vent valve 19 to permit the flow, of sewage or the like by gravity in thereceptacle. When the receptacle is filled, air tra pad in the upper bell lifts the float rod an shifts the va ve 35 to connect the fluid ressure devices to the cit water supply. entrvalve 19 and pilot switch 32 are then I closed and, under these conditions, the pump operates to supply air under pressure through the pipes 20 and 17 and thereby forces the contents of the rece tacle out. through the discharge pipe 14. e5 thereceptacle is nearly emptied, liquid trapped in the lower bell 46 'will return the pilot valve to the position shown in the drawings, so that the springs of the fluid pressure devices open the vent valve and pilot switch and so stop the pump and permit the ventin of a1r from the rece tacle as it is again Preferably, to 'hol the pilot valve in one 1 or the other of its'positions'the bell crank lever42 is provided with a weight which, as the'valve is moved, shifts to one side or i the other. of a dead center position.

5 With the present improved sp the automatic controlling devices can e of simsuch automatic devices and, the electric switches can be located outside of the ejector tails set forth withoutdeparture from the scope ofthe invention as defined in the claims.

I claim as my invention 1. In combination in an ejector system for sewage and the like, a receptacle having an inlet and an outlet provided with check valves, an air ump ,directly connected to said receptac e for forcing liquid therefrom and means actuated by fluid pressure independent of the pump and controlled by the level in the receptacle for starting and stopping the pump and. for controlling the vent-ing of air from the receptacle.

o 2. In combination in a periodically operating ejector system for sewage and the like, a-receptacle having an inlet and an outlet provided with check valves, an alr pump directlyconnected to the receptacle for forcing liquid therefrom, fluid pressure means controlling the starting and stoppin of the pump and the venting of air froi n the receptacle, and float valve means actuated by the high and low levels-i in the receptacle and adapted to control a source of fluid pressure independent of the pump to thereby efi'ect the operation of V said fluid pressure means.

sure device, means .controlled thereby for starting and stoppin the pump, a float controlled by the liquid level in the receptacle and a valve mechanically actuated by said float and adapted to control a source of fiuid'pressure independent of the. pump to thereby eflect the operation of said fluid pressure device.

4. In combination in a periodically operating ejector system for sewage and the like, a receptacle having an inlet and an outlet provided with check valves, an air pump connected directly to said'receptacle forv forcing liquid therefrom, a valve controlling the venting of air from the receptacle, a fluid pressure device for intermittently closing and opening said valve, a

float controlled by the liquid level in the receptacle and a valve mechanically actuated by said float and arranged to control a source of fluid pressure independent of:

the pump to thereb effect the operation of said fluid pressure evice. a

5. In combination in a sewage e ector sys- -ple, inexpensive form. For the most part tem, a receptacle having an inlet and -an outlet provided with check valves, an air pump directl connected to the receptacle for forcing liquid therefrom, a valve con:

trolling the venting of air from the receptacle, and means actuated ,by fluid pressure independent of the pump and controlled by the level of liquid in the receptacle for starting "and stopping the pump and for closing and opening the vent valve.

6. In combination in a periodically operating ejector system for. sewage and the like, a receptacle having an inlet and an outlet. provided with check valves, an air pump directly connected to the receptacle for forcing liquid therefrom, a valve for controlling the venting of air from the receptacle, fluid pressure means for starting and stopping the pump and closing and opening said vent valve, a float controlled by the liquid level in the receptacle and a valve mechanically actuated by said float and adapted to control a source of fluid pressure independent of the pump to thereby efle-ct the operation of said fluid pressure means. i

7. In combination in a periodically oper- Y the receptacle, fluid pressure devices for starting and stopping the pump and for closing and opening said vent valve respectively, and a float valve actuated by the high and low levels in the receptacle arranged to simultaneously connect and disconnect said fluid pressure devices to and from a source of fluid pressure independent of the pump.

CHARLES YEOMANS. 

